3 pack, 3 Air Filters Plus 3 Pre-Filters Replaces Briggs & Stratton 491588, 491588S Air Filter; 491435, 491435S Pre-Filter. 3 Quality Aftermarket Air Filters plus 3 Pre-Filters Replaces Briggs & Stratton Air filter Part number 491588, 491588S (quantity 3) Includes also replacement for Briggs pre-filter 491435, 491435S (quantity 3) 4-1/2" Width, 5-1/4" Length, 3/4" Height